A ZFS file system is created by setting a quota and reservation to the same value.

Answer: A Explanation:

By default, a LUN reserves exactly enough space to completely fill the volume. This ensures that clients will not get out-of-space errors at inopportune times. This property allows the volume size to exceed the amount of available space. When set, the LUN will consume only the space that has been written to the LUN. While this allows for thin provisioning of LUNs, most filesystems do not expect to get quot;out of spacequot; from underlying devices, and if the share runs out of space, it may cause instability and/or data corruption on clients.

Question No: 19

Which is the most effective metric for identifying performance issues?

Latency

IOPS

Throughput

Percent utilization

Capacity

Answer: A

Explanation: For identifying performance issues, latency is essential. Paraphrasing performance expert Greg Brendan, latency is time spent waiting, and it has a direct impact on performance when caused by a synchronous process within an application request, thus making interpretation straightforward – the higher the latency, the worse the performance. This is in contrast to other metrics used in performance analysis – utilization, IOPS (I/O per second) and throughput – which are better suited for capacity planning and understanding the nature of workloads.